US4270109A - Bounce-free lifting device - Google Patents

Bounce-free lifting device Download PDF

Info

Publication number
US4270109A
US4270109A US06/039,568 US3956879A US4270109A US 4270109 A US4270109 A US 4270109A US 3956879 A US3956879 A US 3956879A US 4270109 A US4270109 A US 4270109A
Authority
US
United States
Prior art keywords
lifting device
core
armature
bounce
lifting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/039,568
Other languages
English (en)
Inventor
Eberhard Riessland
Karl-Heinz Kruger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer Chemtech AG
Elektromat VEB
Original Assignee
Elektromat VEB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elektromat VEB filed Critical Elektromat VEB
Assigned to VEB ELEKTROMAT reassignment VEB ELEKTROMAT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KRUGER KARL-HEINZ, RIESSLAND EBERHARD, OGAWA, TADASHI
Application granted granted Critical
Publication of US4270109A publication Critical patent/US4270109A/en
Anticipated expiration legal-status Critical
Assigned to SULZER CHEMTECH AG reassignment SULZER CHEMTECH AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOCH-GLITSCH,LP
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/088—Electromagnets; Actuators including electromagnets with armatures provided with means for absorbing shocks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • H01F7/1646—Armatures or stationary parts of magnetic circuit having permanent magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets

Definitions

  • the invention concerns a bounce-free lifting device, preferably for semi-conductor wafers in automatic wafer probes, which allows attaining a rapid lifting movement in sensitive systems.
  • GDR Letters Patent WP 101 783 describes a lifting device for rapid and bounce-free contacting, where the armature is held in two Belleville springs which, by having a steeper load-deflection line, will act with their spring effect against the force-travel line of the electromagnet.
  • the spring constant is adjustable herein by variable initial tensioning.
  • This lifting device is limited in its application to relatively small forces, i.e., with large semi-conductor wafers it is not possible to realize short operating times. The reasons herefor can be found in the large counteracting force of the progressively acting spring and the thus resulting high power requirement of the solenoid coil.
  • the gripping head consists of several individual parts and that exact parallel guiding of the holding surface in the operating position is difficult.
  • the task of the invention consists in braking the movement of the armature prior to reaching the end positions through effective attenuation by means of a gas, preferably air, which flows out under pressure between the abutment faces of the core and the armature, so that the air between the abutment faces will be compressed and flow to the exterior through further attenuating devices.
  • a gas preferably air
  • the invention concerns a bounce-free lifting device wherein a gripper head mounted on a lifting armature will be moved in vertical direction between two end positions, by one or several electromagnets.
  • the lifting armature is provided with a guide connected to the ferromagnetic core. Equally-spaced nozzles are arranged in the guide. One upper face of the ferromagnetic core is assigned a first abutting face of the lifting armature, and a lower face is assigned a second abutting face. Further nozzles are arranged equally spaced in one or several faces of the ferromagnetic core or of the lifting armature.
  • a gas preferably air flows under pressure from the nozzles.
  • a first intermediate space is arranged between the upper face of the core and the first abutment face of the lifting armature, and a second intermediate space is arranged between the lower face and the second abutment face.
  • Narrow passages are provided as connection between the intermediate spaces and the exterior.
  • the cross section of the narrow passages depends upon the position of the lifting armature. It is also possible to have the cross section of the narrow passages made variable by using throttling members.
  • the narrow passages could possibly also be directly formed by the intermediate spaces.
  • the narrow passages serve for the suppression of the spring effect of the lifting armature upon the air cushion.
  • the abutment faces and/or the lower and upper faces, are in given instances split into magnetizable and non-magnetizable zones. The relation between forces of attraction and attenuation is adjusted thereby.
  • the lifting device contains one or two electromagnets.
  • a linear or non-linear return spring acting opposed to the direction of the magnetic circuit of the relevant electromagnet, will, in a given case, be provided between the lifting armature and the core.
  • each of the two end positions is assigned one electromagnet and thus a magnetic circuit, it is furthermore possible to couple both magnetic circuits via a common ground terminal.
  • the ground terminal will contain a permanent magnet which may also be assembled from segments. The permanent magnet prevents power loss on holding the lifting device, since only one electrical impulse is necessary to move the lifting armature.
  • FIG. 1 A section through the bounce-free lifting device.
  • FIG. 2 Arrangement of the throttling members for adjusting the cross section of the narrow passages.
  • FIG. 3 Division of areas into magnetizable and non-magnetizable zones.
  • FIG. 4 Lifting device with one electromagnet.
  • the bounce-free lifting device for semi-conductor wafers as per FIG. 1 is of symmetric design around its axis of rotation and consists of a ferromagnetic core 1.
  • a lifting armature 2 surrounds the core 1.
  • the lifting armature 2 on its part is encircled by the guide wall 3.
  • the core carries two electromagnets 4; 5, separated by the magnetic short-circuit member 6 which is connected with the core.
  • the upper electromagnet 4 is assigned a magnetic circuit 7 and the lower electromagnet 5 is assigned a magnetic circuit 8.
  • the nozzles 9 are equally distributed.
  • the upper face 10 of the core 1 is assigned the first abutment face 16 of the lifting armature 2, and a lower face 12 is assigned a second abutment face 17.
  • the nozzles 11 are equally distributed within the upper face 10 and the nozzles 13 are provided within the lower face 12.
  • the nozzles 9; 11; 13 are connected via the passage system 14 with a connector 15.
  • the face 10 and the abutment face 16 delimit an intermediate space 18 and the face 12 and the abutment face 17 an intermediate space 19.
  • the intermediate space 18; 19 are, in given instances, connected with the exterior by narrow passages 20.
  • the cross section of the narrow passages 20 may be determined by the position of the lifting anchor 2, or throttling members 21 may be provided as shown in FIG. 2.
  • the member 6 contains one permanent magnet 24 also assembled from segments to accommodate the work pieces.
  • the lifting armature 2 carries a clamping table 25.
  • Exhaust passages 26 are arranged in the guide wall 3 to complete the connection of the intermediate space 19 and the narrow passages 20 to the exterior.
  • Anti-rotating safeties are provided in the guide wall 3 to preclude inadvertent rotating of the lifting armature 2 relative to the guide wall 3 and thus to the core 1.
  • a lifting device such as per FIG. 4 is also possible, with only one magnetic circuit 27 assigned to the core 1 and the lifting armature 2.
  • a return spring 28 acting against the effective direction of the magnetic circuit may, if required, be attached between the core 1 and the lifting armature 2.
  • the return spring 28 may have here linear or non-linear characteristics.
  • the air contained in the intermediate space 18 or 19 will be compressed and will slowly exhaust to the exterior.
  • the cross section of the narrow passages 20 may, in given instances, be adjusted in the manner described.
  • the division into magnetizable zones 22 and non-magnetizable 23 also serves for the setting of the desired ratio of force and for the attainment of an attenuated braking sequence.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Braking Arrangements (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)
  • Machine Tool Units (AREA)
  • Linear Motors (AREA)
  • Advancing Webs (AREA)
  • Chutes (AREA)
  • Non-Mechanical Conveyors (AREA)
US06/039,568 1978-06-01 1979-05-15 Bounce-free lifting device Expired - Lifetime US4270109A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD20572278A DD137037B1 (de) 1978-06-01 1978-06-01 Prellfreie hubeinrichtung
DD205722 1978-06-01

Publications (1)

Publication Number Publication Date
US4270109A true US4270109A (en) 1981-05-26

Family

ID=5512879

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/039,568 Expired - Lifetime US4270109A (en) 1978-06-01 1979-05-15 Bounce-free lifting device

Country Status (12)

Country Link
US (1) US4270109A (cs)
JP (1) JPS551198A (cs)
BG (1) BG32235A1 (cs)
CH (1) CH642476A5 (cs)
CS (1) CS222966B1 (cs)
DD (1) DD137037B1 (cs)
DE (1) DE2920907A1 (cs)
FR (1) FR2427171A1 (cs)
GB (1) GB2022322B (cs)
HU (1) HU182647B (cs)
SE (1) SE442464B (cs)
SU (1) SU1015448A1 (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975637A (en) * 1989-12-29 1990-12-04 International Business Machines Corporation Method and apparatus for integrated circuit device testing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3132919A1 (de) * 1980-12-09 1982-09-02 VEB Zentrum für Forschung und Technologie Mikroelektronik, DDR 8080 Dresden "stellantrieb"
DE3541272A1 (de) * 1985-11-22 1987-05-27 Thomson Brandt Gmbh Magnetbandgeraet
JPH01205438A (ja) * 1988-10-12 1989-08-17 Hitachi Ltd 磁気搬送装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936743A (en) * 1974-03-05 1976-02-03 Electroglas, Inc. High speed precision chuck assembly
US3972505A (en) * 1975-04-04 1976-08-03 Skinner Precision Industries, Inc. Control valve

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE638721C (de) * 1936-11-21 Adolf Hanning Elektrischer Zug- und Druckmagnet
DE1737087U (de) * 1953-07-11 1957-01-03 Magnetschultz Spezialfabrik Fu Elektrobetaetigungsmagnet mit gedaempfter ankerbewegung.
DE1414815A1 (de) * 1960-10-24 1968-10-03 List Dipl Ing Heinrich Polarisierter Doppelhubmagnet
CH452702A (de) * 1965-12-24 1968-03-15 Runtal Holding Co Sa Betätigungseinrichtung mit einem Elektromagnet und beliebig einstellbarer hydraulischer Verzögerung
DE1614049B2 (de) * 1967-03-31 1971-10-21 Licentia Patent Verwaltungs GmbH, 6000 Frankfurt Elektromagnet fuer schaltgeraete
DD101783A1 (cs) * 1972-12-20 1973-11-12

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936743A (en) * 1974-03-05 1976-02-03 Electroglas, Inc. High speed precision chuck assembly
US3972505A (en) * 1975-04-04 1976-08-03 Skinner Precision Industries, Inc. Control valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975637A (en) * 1989-12-29 1990-12-04 International Business Machines Corporation Method and apparatus for integrated circuit device testing

Also Published As

Publication number Publication date
DD137037A1 (de) 1979-08-08
FR2427171B3 (cs) 1982-05-07
SU1015448A1 (ru) 1983-04-30
HU182647B (en) 1984-02-28
JPS551198A (en) 1980-01-07
BG32235A1 (en) 1982-06-15
SE442464B (sv) 1985-12-23
FR2427171A1 (fr) 1979-12-28
CH642476A5 (de) 1984-04-13
DE2920907A1 (de) 1979-12-20
DD137037B1 (de) 1980-07-23
GB2022322A (en) 1979-12-12
SE7904779L (sv) 1979-12-02
CS222966B1 (en) 1983-08-26
GB2022322B (en) 1982-11-10

Similar Documents

Publication Publication Date Title
US6184503B1 (en) Riveter
US6422533B1 (en) High force solenoid valve and method of improved solenoid valve performance
US4932439A (en) Solenoid actuated three-way valve
KR20030007460A (ko) 영구 자석 액추에이터 기구
EP0718532B1 (en) Directional flow control valve
US4554610A (en) Magnetic gripping device
CA2269302A1 (en) Proportional variable force solenoid control valve with segmented permanent magnet
US4835503A (en) Linear proportional solenoid
US4270109A (en) Bounce-free lifting device
US6242994B1 (en) Apparatus to reduce push back time in solenoid valves
CN111541352A (zh) 包括气隙内的可移位铁磁构件的螺线管
US12078218B2 (en) Silent electromagnetic brake
US5233895A (en) Magnetic plate punch actuator
DE3402768A1 (de) Bistabiles magnetisches stellglied
US3621422A (en) Magnetic actuator
US4394592A (en) Long stroke linear actuator
CA2087392A1 (en) Double solenoid valve actuator
US3218534A (en) Electromagnetic linear positioning apparatus
US3145327A (en) Solenoid magnetic damper
US20250376996A1 (en) Magnetic actuating device
JPS61200386A (ja) 電磁ポンプ
JP3426161B2 (ja) 被駆動体の直線駆動装置
JPS6046307B2 (ja) 流体流量制御弁
DE2903362A1 (de) Elektromagnetische bremsluefteinrichtung fuer rotierende motoren
SU1177579A1 (ru) Пневмораспределитель

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED CASE

AS Assignment

Owner name: SULZER CHEMTECH AG, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KOCH-GLITSCH,LP;REEL/FRAME:015134/0992

Effective date: 20030331